Despite my best efforts with my limited skills in this area, I have not been able to make the background transparent. It starts off white but then fills in with a grey then the box opens.. The box is fine, but I cannot alpha out the grey fill.. What am I missing..

If the overlay is not transparent, then the overlayColor option has not been set to transparent for the floatbox in question.

If you don't know how to set options, please review the Floatbox Instructions on this topic. If you do believe that overlayColor has indeed been set correctly, please provide a link to a stripped down example page showing the problem and I'll be able to take a look and see where the problem lies.

The option for the overlay color is named overlayColor. The value for that option is transparent, if you want a transparent overlay. The options sections of the instructions clearly describe the simple task of assigning options. For example, data-fb-options="overlayColor:transparent"